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4.3. Harmonics Current Measurement

4.3.1. Limit

Limits of Class A Harmonics Currents

Harmonics Order

Maximum Permissible

harmonic current

Harmonics Order

Maximum Permissible

harmonic

current

n (A) n (A)

Odd harmonics Even harmonics

3 2.30 2 1.08

5 1.14 4 0.43

7 0.77 6 0.30

9 0.40 8 ≤ n ≤ 40 0.23 * 8/n

11 0.33

13 0.21

15 ≤ n ≤ 39 0.15 * 15/n

Limits of Class B Harmonics Currents

For Class B equipment, the harmonic of the input current shall not exceed the maximum permissible

values given in table which is the limit of Class A multiplied by a factor of 1.5.

Limits of Class C Harmonics Currents

Harmonics Order

Maximum Permissible harmonic current

Expressed as a percentage of the input current at the fundamental frequency

n (%)

2 2

3 30．λ

＊

5 10

7 7

9 5

11 ≤ n ≤ 39

(odd harmonics only)

＊λ is the circuit power factor

Limits of Class D Harmonics Currents

Harmonics Order

Maximum Permissible harmonic

current per watt

Maximum Permissible

harmonic current

n (mA/W) (A)

3 3.4 2.30

5 1.9 1.14

7 1.0 0.77

9 0.5 0.40

11 0.35 0.33

11 ≤ n ≤ 39

(odd harmonics only)

3.85/n See limit of Class A

A Test Lab Techno Corp.

Report Number: 1402CE13-01

34 of 153

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